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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Contactless Deformation Monitoring of Bridges with Spatio-Temporal Resolution: Profile Scanning and Microwave
Florian Schill1, Chris Michel2, Andrei Firus3
1Institute of Geodesy-Geodetic Measuring Systems and Sensor Technology, Technical University of Darmstadt, Franziska-Braun-Straße 7, 64287 Darmstadt, Germany.
Sensors (Basel, Switzerland)
|December 11, 2022
Summary
Contactless sensors like profile scanning and microwave interferometry offer advanced bridge monitoring. This study compares their capabilities for assessing structural health and remaining service life in operational bridges.
Area of Science:
- Structural Engineering
- Geophysics
- Civil Engineering
Background:
- Aging infrastructure necessitates advanced condition assessment for bridges.
- Structural monitoring, especially using contactless sensors, aids in evaluating remaining service life.
- Profile scanning and microwave interferometry are key contactless technologies for bridge measurement.
Purpose of the Study:
- To analyze and compare profile scanning and microwave interferometry for bridge deformation monitoring.
- To discuss the advantages and disadvantages of each sensor technology.
- To identify challenges and limitations for real-world application in operational bridges.
Main Methods:
- Conceptual comparison of profile scanning and microwave interferometry.
- Analysis of sensor capabilities for spatially distributed absolute displacement detection.
- Evaluation of high sampling rate for dynamic structural behavior detection.
Main Results:
- Both profile scanning and microwave interferometry enable spatially distributed absolute displacement detection.
- High sampling rates allow for the capture of dynamic structural behavior.
- Real-world measurement results from an operational railway bridge illustrate findings.
Conclusions:
- Contactless sensors offer efficient, non-disruptive bridge monitoring solutions.
- Profile scanning and microwave interferometry present distinct advantages and limitations for deformation monitoring.
- Understanding these sensor limitations is crucial for effective application in operational bridges.
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